<p>The vertex detector is crucial for precision measurements of the Higgs boson at the electron-positron Higgs factory. Benchmarked with <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mi>H</mi> <mo>→</mo> <mi>c</mi> <mover accent="true"> <mi>c</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( H\to c\overline{c} \)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mi>H</mi> <mo>→</mo> <mi>s</mi> <mover accent="true"> <mi>s</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( H\to s\overline{s} \)</EquationSource> </InlineEquation> measurements in the <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo stretchy="true">¯</mo> </mover> <mi>H</mi> </math></EquationSource> <EquationSource Format="TEX">\( \nu \overline{\nu}H \)</EquationSource> </InlineEquation> channel, we perform an optimisation study on the inner radius and spatial resolution of the vertex detector using the Jet Origin Identification (JOI) framework, which determines the parton flavour of jets using advanced Artificial Intelligence (AI) algorithm. We observe that, compared to the reference detector configuration, halving the inner radius and spatial resolution improves the transverse and longitudinal impact parameter resolution approximately by a factor of two, while increasing the accuracy and significance of the <InlineEquation ID="IEq4"> <EquationSource Format="MATHML"><math display="inline"> <mi>H</mi> <mo>→</mo> <mi>c</mi> <mover accent="true"> <mi>c</mi> <mo stretchy="true">¯</mo> </mover> <mo>/</mo> <mi>s</mi> <mover accent="true"> <mi>s</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( H\to c\overline{c}/s\overline{s} \)</EquationSource> </InlineEquation> measurement by 4% and 8%, respectively. Conversely, doubling these parameters results in comparable degradation, with variations in the inner radius being the dominant factor. Our results provide guidance for detector design and highlight promising prospects for identifying the <InlineEquation ID="IEq5"> <EquationSource Format="MATHML"><math display="inline"> <mi>H</mi> <mo>→</mo> <mi>s</mi> <mover accent="true"> <mi>s</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( H\to s\overline{s} \)</EquationSource> </InlineEquation> decay mode at future Higgs factories.</p>