Any process that activates or increases the frequency, rate or extent of blood vessel branching.
Synonyms:
exact_synonym:
positive regulation of branching involved in blood vessel morphogenesis; up regulation of branching involved in blood vessel morphogenesis; up regulation of patterning of blood vessels; upregulation of branching involved in blood vessel morphogenesis; upregulation of patterning of blood vessels
narrow_synonym:
activation of branching involved in blood vessel morphogenesis; activation of patterning of blood vessels