In this paper, we present a new parallel programming environment, which is called DOVE (Distributed Object-oriented Virtual computing Environment), based on distributed object model. A parallel program is built as a collection of concurrent and autonomous objects interacting with one another via method invocation. It appears to a user logically as a single virtual computer for a set of heterogeneous hosts connected by a network as if objects in remote site reside in one virtual computer. The main goal of DOVE is to provide users with easy-to-use programming environment while supporting efficient parallelisms encapsulated and distributed among objects. Efficient parallelisms are supported by various types of method invocation and multiple method invocation to the object group. For the performance evaluation purpose of DOVE, we have developed two parallel applications both on DOVE and PVM. Our experiment shows that DOVE has better performance than PVM and provides an efficient and easy-to-use parallel programming environment for a set of heterogeneous and clustered computers.