Abstract: First introduced is the main characteristics of PJVM（parallel Java virtual machine）,and then addressed are some key issues such as synchronous problem among multi threads and the implementation of distributed sharing memory when expanding Java object libraries to support distributed parallel computing and processing on heterogeneous networks.Some examples are also presented in order to evince that the multiple programming interfaces and computing modes provided by PJVM are feasible. All of these indicate that PJVM opens up a new realm for Java application and lays down foundation for large scale parallel processing on massive problems on heterogeneous world wide networks such as Internet.