In the context of globalization, modern dance education urgently needs to integrate cross-cultural perspectives and technological tools to enhance teaching and creative efficiency. In this study, a system framework based on the synergistic application of cross-cultural dance and creation is designed with motion capture technology and neural fusion shape technology as the core. By constructing a dance movement choreography assistance system, combining quaternion-based motion retrieval, multi-level B-spline motion path editing algorithms, and virtual character models generated by the neural fusion shape technology, the efficient synthesis of dance movements and cross-cultural resource integration are realized. The results showed that the students in the experimental group using the system were significantly better than the traditional teaching group in terms of dance skills (movement fluency, body posture, rhythmic accuracy) and physical qualities (comprehensive balance, sensitive coordination) (P<0.05), and the total performance was improved by 6.50% (79.07±2.35 in the experimental group and 74.17±2.63 in the control group). The establishment of the cross-cultural teaching resource library and the automatic curriculum generation algorithm effectively supported the curriculum design under the multicultural perspective. This study provides theoretical and practical basis for technological innovation and cross-cultural integration in modern dance education.