How to determine the force field for the new atom, new bond et al using REACTER ?
I suspect that your post is missing words. But, if you are asking about the force field for the reaction templates, it should typically be the same as that used in your simulation.
Thanks for reply，maybe I didn’t express it clearly,
In the beginning, there is no force field for describing the new atom types, bond types and et all,
do I need to prepare force field parameters for these new atom types, bond types and et al in advance?
Yes, the reaction templates should contain all topology information. Data files are easily converted to molecule templates, so molecule templates can typically be created the same way you created your data file.