Abstract: Two iPhone production line companies of Apple Inc.in China were suspected to force employees who had been poisoned by n-hexane into signing the work-related injury compensation agreements,which included some illegal clauses such as " first quit and then compensation".It disclosed the difficulties in identifying occupational disease and acquiring legal rights through legal process for the migrant workers in China.This paper discussed on the causes of such event,the validity of such work-related injury compensation agreements,and how to protect own rights after signing work-related injury compensation agreements reluctantly for the migrant workers suffered from occupational disease;and tried to give useful advices for helping such migrant workers.