Zhè shì yí xiàng jīngchángxìng gōngzuò, bú shì línshí rènwù.
This is ongoing work, not a one-off task.
Tips
usage
经常性 is a bureaucratic/formal modifier meaning 'on a regular basis' — common in policy and corporate language. Contrast with 临时性 (línshíxìng, 'temporary/ad hoc').