Abstract: Lean combustion can improve engine efficiency and reduce emissions,while turbulent jet ignition（TJI）is a technology that can achieve stable ignition of lean mixture. Based on a single-cylinder four-stroke TJI gasoline engine with a compression ratio of 13.0,an expansion of light-load and high-load limits was experimentally studied and a full-load operation strategy was proposed. In terms of high-load expansion,the strategy of intake boosting was adopted. In terms of light-load expansion,the effects of both quality adjustment strategy and quantity adjustment strategy were compared. The results show that the intake boosting can expand the high-load limit of the TJI engine. After the intake boosting strategy is adopted,the upper limit of the indicated mean effective pressure（IMEP） of the engine can be expanded to 1.06 MPa,and the indicated specific fuel consumption（ISFC） is reduced. Under light-load operating conditions,the quantity adjustment strategy is significantly better than the quality adjustment strategy in terms of fuel economy and emissions. The main reason is that too lean mixture is not conducive to flame propagation under light-load conditions,a certain concentration of the mixture must be ensured to achieve efficient combustion. Finally,a TJI engine operation strategy was proposed to realize the efficient operation of the TJI engine under full range of load conditions.