diff --git a/CHANGELOG.md b/CHANGELOG.md
index aec3b9c0c..552418b3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Introduce new methods of `sesolve_map` and `mesolve_map` for advanced usage. Users can now customize their own `iter`ator structure, `prob_func` and `output_func`. ([#565])
 - Use `ProgressMeter.jl` for progress bar rather than our in-house implementation. ([#569])
+- Simplify type structure for time evolution solutions. ([#572])
 
 ## [v0.37.0]
 Release date: 2025-10-12
@@ -341,3 +342,4 @@ Release date: 2024-11-13
 [#557]: https://github.com/qutip/QuantumToolbox.jl/issues/557
 [#565]: https://github.com/qutip/QuantumToolbox.jl/issues/565
 [#569]: https://github.com/qutip/QuantumToolbox.jl/issues/569
+[#572]: https://github.com/qutip/QuantumToolbox.jl/issues/572
diff --git a/src/time_evolution/lr_mesolve.jl b/src/time_evolution/lr_mesolve.jl
index de49df963..19ae95941 100644
--- a/src/time_evolution/lr_mesolve.jl
+++ b/src/time_evolution/lr_mesolve.jl
@@ -26,8 +26,7 @@ struct TimeEvolutionLRSol{
     TE<:Matrix{ComplexF64},
     RetT<:Enum,
     AlgT<:OrdinaryDiffEqAlgorithm,
-    AT<:Real,
-    RT<:Real,
+    TolT<:Real,
     TSZB<:AbstractVector,
     TM<:Vector{<:Integer},
 }
@@ -38,8 +37,8 @@ struct TimeEvolutionLRSol{
     fexpect::TE
     retcode::RetT
     alg::AlgT
-    abstol::AT
-    reltol::RT
+    abstol::TolT
+    reltol::TolT
     z::TSZB
     B::TSZB
     M::TM
diff --git a/src/time_evolution/time_evolution.jl b/src/time_evolution/time_evolution.jl
index d7c332e27..f7f1b70b1 100644
--- a/src/time_evolution/time_evolution.jl
+++ b/src/time_evolution/time_evolution.jl
@@ -66,8 +66,7 @@ struct TimeEvolutionSol{
     TE<:Union{AbstractMatrix,Nothing},
     RETT<:Enum,
     AlgT<:OrdinaryDiffEqAlgorithm,
-    AT<:Real,
-    RT<:Real,
+    TolT<:Real,
 }
     times::TT1
     times_states::TT2
@@ -75,8 +74,8 @@ struct TimeEvolutionSol{
     expect::TE
     retcode::RETT
     alg::AlgT
-    abstol::AT
-    reltol::RT
+    abstol::TolT
+    reltol::TolT
 end
 
 function Base.show(io::IO, sol::TimeEvolutionSol)
@@ -140,8 +139,7 @@ struct TimeEvolutionMCSol{
     TJT<:Vector{<:Vector{<:Real}},
     TJW<:Vector{<:Vector{<:Integer}},
     AlgT<:OrdinaryDiffEqAlgorithm,
-    AT<:Real,
-    RT<:Real,
+    TolT<:Real,
 } <: TimeEvolutionMultiTrajSol{TS,TE}
     ntraj::Int
     times::TT1
@@ -152,8 +150,8 @@ struct TimeEvolutionMCSol{
     col_which::TJW
     converged::Bool
     alg::AlgT
-    abstol::AT
-    reltol::RT
+    abstol::TolT
+    reltol::TolT
 end
 
 function Base.show(io::IO, sol::TimeEvolutionMCSol)
@@ -215,8 +213,7 @@ struct TimeEvolutionStochasticSol{
     TE<:Union{AbstractArray,Nothing},
     TEM<:Union{AbstractArray,Nothing},
     AlgT<:StochasticDiffEqAlgorithm,
-    AT<:Real,
-    RT<:Real,
+    TolT<:Real,
 } <: TimeEvolutionMultiTrajSol{TS,TE}
     ntraj::Int
     times::TT1
@@ -226,8 +223,8 @@ struct TimeEvolutionStochasticSol{
     measurement::TEM
     converged::Bool
     alg::AlgT
-    abstol::AT
-    reltol::RT
+    abstol::TolT
+    reltol::TolT
 end
 
 function Base.show(io::IO, sol::TimeEvolutionStochasticSol)
@@ -408,7 +405,7 @@ function _ensemble_dispatch_prob_func(rng, ntraj, tlist, prob_func; kwargs...)
 end
 
 function _ensemble_dispatch_solve(
-    ens_prob_mc::TimeEvolutionProblem,
+    ens_prob::TimeEvolutionProblem,
     alg::Union{<:OrdinaryDiffEqAlgorithm,<:StochasticDiffEqAlgorithm},
     ensemblealg::ET,
     ntraj::Int,
@@ -416,25 +413,25 @@ function _ensemble_dispatch_solve(
     sol = nothing
 
     @sync begin
-        @async while take!(ens_prob_mc.kwargs.channel)
-            next!(ens_prob_mc.kwargs.progr)
+        @async while take!(ens_prob.kwargs.channel)
+            next!(ens_prob.kwargs.progr)
         end
 
         @async begin
-            sol = solve(ens_prob_mc.prob, alg, ensemblealg, trajectories = ntraj)
-            put!(ens_prob_mc.kwargs.channel, false)
+            sol = solve(ens_prob.prob, alg, ensemblealg, trajectories = ntraj)
+            put!(ens_prob.kwargs.channel, false)
         end
     end
 
     return sol
 end
 function _ensemble_dispatch_solve(
-    ens_prob_mc::TimeEvolutionProblem,
+    ens_prob::TimeEvolutionProblem,
     alg::Union{<:OrdinaryDiffEqAlgorithm,<:StochasticDiffEqAlgorithm},
     ensemblealg,
     ntraj::Int,
 )
-    sol = solve(ens_prob_mc.prob, alg, ensemblealg, trajectories = ntraj)
+    sol = solve(ens_prob.prob, alg, ensemblealg, trajectories = ntraj)
     return sol
 end