Abstract: Objective Through inspecting the changes of four blood biochemical indexes(lactate dehydrogenase,muscle protein,creatine phosphokinase,creatine phosphokinase isozyme)in blood of 20 myocardial infarction deathes to obtain the data of biochemical value change,to explore the Forensic significance of change rule after death in diagnosis myocardial infarction and identif ication of the cause of death.Methods We took subclavian vein blood 10 mL from 20 diagnosed myocardial infarction in different time after the d...