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The coal gasification has become the core technology of todays clean coal technologies for efficient and clean.In this paper,one type of dry pulverized coal cyclone gasifier is proposed.This gasifier is featured with four burners injecting the oxidant in the same cutting angle and section of gasifier body aim to achieve the rotating flow field and increase the residence time.So the research works use the experimental and numerical methods to investigate the most optimal cutting angle and location of secondary air inlets for increasing the lifetime of nozzles and enhance the gasification performance.Though the analysis of the gas phase turbulent intensity,the gas axis-velocity profile,the gas tangential velocity profile and the particle trajectory under different cases by the cold-model simulations,the best structural parameters is 45°cutting angle and L/D=0.6 section of secondary air inlets.The results obtained by the hot-model simulations under this structural parameters can be able to achieve the well gasification performance,in particular,the carbon conversion ratio is highest.Meanwhile,though the analysis of velocity distribution of gas-solid phase in the gasifier measuring by PIV,the most optimal cutting angle range is between 45°to 60°,and the location range of secondary air inlets is between L/D=0.7 to L/D=1.0.So the results obtained by the cold-model simulations are validated to some extent by comparing the experiment conditions.