根据官网的说法: http://www.immi.gov.au/Visas/Pages/600.aspx
针对PR或者citizen父母的长签证(有效期18月或以上的):
• Health insurance: You must maintain fully comprehensive health insurance while you are in Australia. You could be asked to provide evidence of 12 months health insurance cover when you apply. Reciprocal health arrangements are not adequate to meet this requirement.