Abstract: 【Objective】 To study the effects of different tree shapes on regional environment light condition in almond-winter wheat intercropping areas in the hope of providing a theoretical basis for selection and optimization of tree shape with high light efficiency under the fruit-grain intercropping mode in southern Xinjiang. 【Methods】 Taking the intercropping mode of almond-winter wheat as the research object, four tree-shaped treatments were set up, including small-canopy shape, open center shape, high-stem shape and stratified shape. During the key growth periods, such as jointing stage, flowering stage and grouting stage, the PAR diurnal variation dynamics and environmental spectral indexes of five intercropping areas, such as far-crown area, near tree canopy area on both east and west sides, under tree canopy area east and west sides were measured and analyzed. 【Results】 Under the inter-cropping mode of almond and winter wheat in southern Xinjiang, the diurnal variation of PAR in different intercropping areas showed a single peak curve, the light conditions were obviously deteriorated from flowering stage to jointing stage in all almond trees during treatments, the rate of PAR descent between 2 stages of small-canopy shape, open-center shape, high-stem and trunk stratified form were in turn as 18.93%, 39.06%, 23.24% and 46.00%; The effect of almond tree on the light environment in intercropping area was basically stable at the stage of flowering. At this period, the light PAR intensity in intercropping areas of different tree shapes were divided into three levels, small-canopy shape, high-stem and open-center shape and the stratified shape. Daily PAR strength was within the 400-1 400 mol/(m²·s) range respectively which accounted for about 70%, 40%, and 20% of the day. 【Conclusion】 Under the almond - winter wheat intercropping mode, during the jointing stage (8 April) to flowing stage (3 May), the daily mean value of PAR in intercropping areas decreased significantly, it was basically stable from flowering (3 May ) to grouting (25 May) stage without significant change. Based on the PAR daily variation of the intercropping region and the results of the analysis, the PAR daily average intensity and the light quality parameters of the intercropping region showed that the 4 tree shapes can be divided into three categories, the best is small-canopy shape, followed by open-center shape and high-stem shape. The two photoqualitative parameters "red orange/far infrared" and "near red light/far red light" can be used as evaluation indexes for the light environmental conditions in intercropping areas.