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Cloud computing is becoming a popular and important solution for building highly reliable applications on distributed resources. However, it is a critical challenge to guarantee the system reliability of applications especially in voluntary-resource cloud due to the highly dynamic environment. In this paper, we present BFT Cloud (Byzantine Fault Tolerant Cloud), a Byzantine fault tolerance framework for building robust systems involuntary-resource cloud environments. BFT Cloud guarantees robustness of systems when up to f of totally 3f+1 resource providers are faulty, including crash faults, arbitrary behaviors faults, etc. BFT Cloud is evaluated in a large-scale real-world experiment which consists of 257 voluntary-resource providers located in 26 countries. The experimental results shows that BFT Cloud guarantees high reliability of systems built on the top of voluntary-resource cloud infrastructure and ensures good performance of these systems.