1. Select varieties with high grafting affinity. Before grafting, we can understand the compatibility between different varieties and choose varieties with high affinity and similar growth conditions for grafting.

2. Choose melons and fruits with similar maturity for grafting. If the maturity of melons and fruits is different, it may lead to poor grafting, so we should choose melons and fruits with similar maturity for grafting.

3. Processing interface. Before grafting, roots and scions need to be carefully treated to make them have the same diameter and smooth cross section to promote healing and growth. At the same time, the conditions such as temperature and humidity should be controlled after grafting to promote healing and survival.

4. Try using growth regulators. Using some growth regulators, such as rooting powder and rooting solution, can help stimulate the growth and healing of plants and improve the success rate of grafting.