Present invention discloses method for dynamical generating caption image data and data stream. It contains 1, visiting caption user describing record obtaining source data, 2, proceed caption attributive resolving to source data of caption user record, obtaining generating caption data rule or listing promise, 3, utilizing step 2 obtained rule or listing promise automatically drawing generating caption image using computer graphic equipment through calculation, and obtaining caption each frame picture image data, single frame image continuously constituting a caption image data sequence, 4, encoding caption image data in step 3 and packaging to data stream fitting digit caption standard data stream. Present invention can enrich digit caption display form, raise data generation and broadcast mobility, diversity and self control performance without manual operation.