Abstract: In order to lay the simulation foundation for variety plant design of rapeseed (Brassica napus L.), the L-system model for rapeseed (Brassica napus L.) was developed by applying parametric L-system and predefined Bézier surface modeling methods to topological model of the flowers and inflorescence. By employing statistical analysis and normalization processing method to the data of field observation, the growth functions of the floral axis and the flower stalk were established through using Sigmoid and Weibull function, respectively. According to the algorithm of Bezier Surface, the petals and sepal of rapeseed flower and their surface models were constructed. Finally, visual growth simulations of the rapeseed flowers and inflorescence were conducted in L-Studio 4.0 platform. The results show that the visual growth process of the rapeseed flowers and inflorescence can be realized by using this method.