diff --git a/KalmanFilter.xcodeproj/project.pbxproj b/KalmanFilter.xcodeproj/project.pbxproj
index 2ba1ffe..6399de8 100644
--- a/KalmanFilter.xcodeproj/project.pbxproj
+++ b/KalmanFilter.xcodeproj/project.pbxproj
@@ -62,10 +62,18 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
-		CEF0076E1D650AEE0084F081 = {
+		B34A80E62637A27B00E320E4 /* Sources */ = {
 			isa = PBXGroup;
 			children = (
 				CEF0077A1D650AEE0084F081 /* KalmanFilter */,
+			);
+			path = Sources;
+			sourceTree = "<group>";
+		};
+		CEF0076E1D650AEE0084F081 = {
+			isa = PBXGroup;
+			children = (
+				B34A80E62637A27B00E320E4 /* Sources */,
 				CEF007861D650AEE0084F081 /* KalmanFilterTests */,
 				CEF007791D650AEE0084F081 /* Products */,
 			);
@@ -179,6 +187,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 			);
 			mainGroup = CEF0076E1D650AEE0084F081;
@@ -360,7 +369,7 @@
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = KalmanFilter/Info.plist;
+				INFOPLIST_FILE = Sources/KalmanFilter/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
@@ -383,7 +392,7 @@
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = KalmanFilter/Info.plist;
+				INFOPLIST_FILE = Sources/KalmanFilter/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
diff --git a/KalmanFilter.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/KalmanFilter.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/KalmanFilter.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/KalmanFilter.xcodeproj/project.xcworkspace/xcuserdata/dechengma.xcuserdatad/UserInterfaceState.xcuserstate b/KalmanFilter.xcodeproj/project.xcworkspace/xcuserdata/dechengma.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000..b6a78ba
Binary files /dev/null and b/KalmanFilter.xcodeproj/project.xcworkspace/xcuserdata/dechengma.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..41b6bb4
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,28 @@
+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "KalmanFilter",
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "KalmanFilter",
+            targets: ["KalmanFilter"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "KalmanFilter",
+            dependencies: []),
+        .testTarget(
+            name: "KalmanFilterTests",
+            dependencies: ["KalmanFilter"]),
+    ]
+)
diff --git a/Sources/.DS_Store b/Sources/.DS_Store
new file mode 100644
index 0000000..1e32086
Binary files /dev/null and b/Sources/.DS_Store differ
diff --git a/KalmanFilter/DoubleExtension.swift b/Sources/KalmanFilter/DoubleExtension.swift
similarity index 100%
rename from KalmanFilter/DoubleExtension.swift
rename to Sources/KalmanFilter/DoubleExtension.swift
diff --git a/KalmanFilter/Info.plist b/Sources/KalmanFilter/Info.plist
similarity index 100%
rename from KalmanFilter/Info.plist
rename to Sources/KalmanFilter/Info.plist
diff --git a/KalmanFilter/KalmanFilter.h b/Sources/KalmanFilter/KalmanFilter.h
similarity index 100%
rename from KalmanFilter/KalmanFilter.h
rename to Sources/KalmanFilter/KalmanFilter.h
diff --git a/KalmanFilter/KalmanFilter.swift b/Sources/KalmanFilter/KalmanFilter.swift
similarity index 100%
rename from KalmanFilter/KalmanFilter.swift
rename to Sources/KalmanFilter/KalmanFilter.swift
diff --git a/KalmanFilter/KalmanFilterType.swift b/Sources/KalmanFilter/KalmanFilterType.swift
similarity index 100%
rename from KalmanFilter/KalmanFilterType.swift
rename to Sources/KalmanFilter/KalmanFilterType.swift
diff --git a/KalmanFilter/Matrix.swift b/Sources/KalmanFilter/Matrix.swift
similarity index 100%
rename from KalmanFilter/Matrix.swift
rename to Sources/KalmanFilter/Matrix.swift
diff --git a/Tests/KalmanFilterTests/KalmanFilterTests.swift b/Tests/KalmanFilterTests/KalmanFilterTests.swift
new file mode 100644
index 0000000..e321c7d
--- /dev/null
+++ b/Tests/KalmanFilterTests/KalmanFilterTests.swift
@@ -0,0 +1,15 @@
+import XCTest
+@testable import KalmanFilter
+
+final class KalmanFilterTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(KalmanFilter().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}
diff --git a/Tests/KalmanFilterTests/XCTestManifests.swift b/Tests/KalmanFilterTests/XCTestManifests.swift
new file mode 100644
index 0000000..bb6fd96
--- /dev/null
+++ b/Tests/KalmanFilterTests/XCTestManifests.swift
@@ -0,0 +1,9 @@
+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(KalmanFilterTests.allTests),
+    ]
+}
+#endif
diff --git a/Tests/LinuxMain.swift b/Tests/LinuxMain.swift
new file mode 100644
index 0000000..6f78afc
--- /dev/null
+++ b/Tests/LinuxMain.swift
@@ -0,0 +1,7 @@
+import XCTest
+
+import KalmanFilterTests
+
+var tests = [XCTestCaseEntry]()
+tests += KalmanFilterTests.allTests()
+XCTMain(tests)