如果你说的是helm-buffers-list，可以试试下面的代码（用的是pinyinlib）
(setq zjy/helm-match-in-pinyin t)
(defun zjy/pinyin-match (pattern candidate)
(let ((case-fold-search t))
(if zjy/helm-match-in-pinyin
(string-match (pinyinlib-build-regexp-string pattern) candidate)
(string-match pattern candidate))))
(defun zjy/helm-buffer--match-pattern (pattern candidate &optional nofuzzy)
(let ((bfn (if (and helm-buffers-fuzzy-matching
(not nofuzzy)
(not helm-migemo-mode)
(not (string-match "\\`\\^" pattern)))
#'helm-buffer--memo-pattern
#'identity))
(mfn (if helm-migemo-mode
#'helm-mm-migemo-string-match #'zjy/pinyin-match)))
(if (string-match "\\`!" pattern)
(not (funcall mfn (funcall bfn (substring pattern 1))
candidate))
(funcall mfn (funcall bfn pattern) candidate))))
(advice-add #'helm-buffer--match-pattern :override #'zjy/helm-buffer--match-pattern)
PS. 就支持拼音过滤这点来说，ivy/selectrum就要方便多了，很容易改变filter函数。