Semiconductor quantum dots are promising hosts for qubits to build a quantum processor.In the last twenty years,intensive researches have been carried out and diverse kinds of qubits based on different types of semiconductor quantum dots were developed.Recent advances prove high fidelity single and two qubit gates,and even prototype quantum algorithms.These breakthroughs motivate further research on realizing a fault tolerant quantum computer.In this paper we review the main principles of various semiconductor quantum dot based qubits and the latest associated experimental results.Finally the future trends of those qubits will be discussed.