Abstract: VHDL-AMS language supports the description and simulation of continuous and mixed continuous/discrete system. In the language, break statement is added to describe discontinuity appearing in continuous system. This paper analyzes the problem found in actual simulators for simulating break list of break statement, and presents to it a solution for calculating the pre-defined attributes Q'dot, Q'integ by combining the equation method and the direct evaluation method. Finally, the correctness and efficiency of the solution are validated by simulation examples.