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The Three-Body Parameter(3BP)$a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-}$ is crucial to understandingEfimov physics, and a universal 3BP has been shown in experiments and theory inultracold homonuclear gases. The 3BP of heteronuclear systems was predicted topossess much richer properties than the homonuclear counterparts for the largeparameter space. In this work, we investigate the universal properties of$a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-}$ for theHeavy-Heavy-Light(HHL) system with negative intraspecies scattering length$a_{\scriptscriptstyle HH}$. We find that$a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-}$ follows a universal behaviordetermined by the van der Waals(vdW) interaction and the mass ratio. Ananalytic formula of $a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-}$ is givenas a function of $a_{\scriptscriptstyle HH}$, which allows an intuitiveunderstanding of how does $a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-}$depend on the mass ratio and the vdW length $r_{\scriptscriptstyle vdW}$. In aspecial case, when the two heavy atoms are in resonance,$a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-}$ is approximately a constant:$a^{\scriptscriptstyle(1)}_{\scriptscriptstyle-} = -(6.3\pm0.6)\,r_{\scriptscriptstyle vdW,HL}$.

Universal Three-Body Parameter of Heavy-Heavy-Light systems with negative intraspecies scattering length